I think i speak for many people when i say if VIA or SIS or even Intel came out with a new chip that not only beats Nvidia in Doom3 but also ATI in HL2 we would all buy it.

It just comes down to who has the best product vs price. I started with ATI cards, then 3dfx, the nvidia for a couple rounds, then an ATI 9800Pro and im pretty sure my next card will be nvidia again, after that who knows.